KIA dealers sells an iPod/iPhone adapter for like $40 that plugs into the Auxiliary and USB port together under the radio. I tried a standard white ipod cable out and plugged it into just the USB port. My iPhone charged and music played perfectly on the radio. In addition to that, apps like Pandora and iheart also worked. The radio controls also controlled the itunes portion of the phone. So what additional features or function does the $40 cable that KIA sells offer?